AUDIO(6)AUDIO(6)NAMEaudio - Inferno audio file format
DESCRIPTION
Inferno audio files accepted by commands such as auplay(1) have a sim‐
ple format. The file contains a header consisting of non-empty lines
of text specifying the data format and characteristics, followed by an
empty line, followed by the audio data in binary form. The data can be
copied directly to a suitable audio device (see audio(3)) correctly
configured, using read, write or stream (see sys-read(2)).
Each header line corresponds to a command that can be written to the
control file audioctl of the audio(3) device. The first line of the
header must be a rate command; other commands can appear in any order.
The commands available are:
rate n The data was recorded at n Hz, typically one of 44100, 22050,
11025 or 8000 but other values are legal.
chans n
There are n channels of audio data (eg, 1 for mono and 2 for
stereo).
bits n Each sample is n bits (typically 8 or 16).
enc e
The string e gives the recording format, and will usually be one
of the following: ulaw, alaw, pcm or adpcm.
The audio data is stored with a sample from each channel in turn
(`left' sample first if stereo, regardless of encoding or data size).
Data encoded as pcm is little-endian, 2's complement if 16-bit, but
unsigned if 8 bit. The adpcm encoding uses 4-bit samples (two mono
samples or one stereo sample per byte, again little-endian).
SEE ALSOauplay(1), audio(3)AUDIO(6)
